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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decf1d0c72e5b25a8fc1add27e738e890301a359d4d9314cdc3c347947850bef' 
  AND token = 'fs+i+xuKhX9dCxZQXiabrxzCzsVldt8V92p78ZkS3NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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