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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff788ba4d64b29fe3be5f44b4ed5c0854ef5d2c8509c3c0348d61f234f235a0' 
  AND token = 'ZWRM7Jovj9i1cI7dif4lCfuntc9UaMnwsoQVdusFAzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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