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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1480e4cd8b8099aebd7dfba0e656b1b9820482c9d46cfaeaf5aec1c2839222a' 
  AND token = 'I5QzbjWBWqMj2MVT+2G492FysSBVRRwxzOKI0DkGQNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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