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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de904161ca11267b48bba9f8cdcb06676e38748028f6032abd18cfcd2c0a60e' 
  AND token = 'BdMNN7EcixQYHetbqx9009QFrYq87Z991p9mJEb18LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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