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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3988d7ecc1dd6c8b3f1ef668ede56bada5c094f5ef2d4666d28e981ec09901' 
  AND token = 'CLzLnWTNmd/PZ9qe4GxRjsm6Dp1A0rX+bJzn7JRLlTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}