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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea76ba5182c9eb546380d951fc6cd1d28cd5961aea1ce71881fab44ef3c520f' 
  AND token = 'yTI1YtF1NI1FayUaNIlrtFf+1qC64Yu2TKKXTvc/N7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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