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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8828e63597cdd5063907f7681d45430e2bcdcba08f25b8aba8fc3e56e13a9501' 
  AND token = 'y1pXdvBTQul6BnlnyMgYpFSrPc1eF2VaZ67HnmZ6lCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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