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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f76c9d8bd413217fc149f1621f27a61a933ee7c84c8291461dc2e932dd1f0a' 
  AND token = 'XSI/8Nb2tRhO2pephiW3vwnHeKYUtC3Sr8ZwVhynG7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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