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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1b6f904fd219e38d526da1533f264504c7f150182ae0a24fde9e49ff478b15' 
  AND token = 'ciIBwGzVX9de7D+9C3pNa5Th53J/Qx5WLF6ks1FR1es=' 
  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"
    }
  }
}