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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d582d26f8d093d8f9ba76ca05155dea4d71ffdea525b466cad07cb1149d50a' 
  AND token = 'z1Vm8dO8BSvwTKxmq2f9UO0SVH/qEPvQuCfs5vcMalQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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