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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b917ea36a573c4baf7b21ab31390772072cfe2b5423f1fee6f82c6730b60c40' 
  AND token = 'fZexEn6oMV1CCE6OL8426eC4AsrJvbIHDgNRD/p8rRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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