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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26899889b51efad8662ffa6c1c1245d6663e9a68a8c9405fed36c7089f233310' 
  AND token = '1kS5J76Cie7lDzB+PG+BJh4abpl4E6/aFysQEyHT+4Q=' 
  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"
    }
  }
}