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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d86cf1c266541a32b50ac5f90d3bc3da3921934c7bb3814c18eb6c30e9d84d' 
  AND token = 'HSDn14/RviCM9ilCzHsxgBrsbxq9rVi28DQecYQr2YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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