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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a0924a8960b65cb82c0bb1fc0ed355ceec10936aa8028ff512c6c358d6c60a' 
  AND token = 't8CRT5zcwxwVAk+Fw4gQYYUy+T2ltfF2X/dUfIJLQeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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