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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec9ca31a5f93d2d4b9f6eb4ae116b486839ceff90f9fac599468ed3d71dda64' 
  AND token = 'x5kg9pJa6iHJjyuRmprv9aUq+saJ73mXe95fnR2ByGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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