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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec43ae6b7ce565c7b7431a8a56494a79916d6cfcedc82811c78b9339a1e4458' 
  AND token = 'cMfgPSHossmFKEOoe3dPvzb6Buv7gzmx2PPWSJdexic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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