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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8414d94886ad87b637fb01ccba8059f7e0f8dd05cfcff2eb620de963a6cc91' 
  AND token = '6yy/YRbVI83X2fe0EnezKs0ro0zknswEznpvoq9v4LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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