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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8610adca04fbbb705b8137e4916fdb527fdf52a901dfed00203e5ee4e0d51856' 
  AND token = '+OifrfPBcmLLp5VhNQvtoag34xDtZL7iWDbOBjKRE1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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