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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98440cf9aa6b726beba14dcfa6f7398044dc39ae69bce43a4d171f7bc3b2aa98' 
  AND token = 'Ny1yghnFDmLfe4cL9GAqJNulv/+jD6GbQ394FbylYbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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