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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d254215322533f2673104151d77341bd250134398fc9ce2b91f0f8e0a6f6692' 
  AND token = '6X1yfNynl5F4VTtlssuTr9kEjeCwDAsqWRsKyzABR+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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