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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fef8459b7ffad2b983af41d998a8723119d6c65cccd3370c5df1889978b983c' 
  AND token = '8vsqNfG+wkPERSdG1RwpfsOf3HWskEtDkhSgVUVtF+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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