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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651f8cf8adaa26b4de845a67e76a33062163eec5aa710dd419936dfc78d2b75f' 
  AND token = 'cqLPIJqEHO94zEgZ3mR2jDPE5EDH/oDVHE0onh8YUcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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