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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8400b7f2c572064056a2b5206f9aaf7b9056e1c39ae3a0d03e0209c36fcb9f' 
  AND token = 'yNXfbs4GqMAYbX3ihlgGQlnKgTXk9DfqzYSLl4Ct1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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