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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0f58aad55bc337decc2a37bb790604a17cafd1267bc6e3d9f8b7d0573be768' 
  AND token = '8Bs+6/QCU4EwPulRTsXs41Wp/LjrIRlRsPoEXU9HZJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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