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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f72daa88f6d0bb1085eb9b8c83780fa35800452f8fdd83563e22ebca379187f' 
  AND token = 'tuzHzL4QIIB8pOsHTsdiOr7qRSbpMVaqoA7v6x1g6pE=' 
  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"
    }
  }
}