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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61716b8c531fa9f5f217b9a91e93d65f676fcaed30d3f3ae467a8a488aa759f' 
  AND token = '1P1HSmGvgWADnJa0wIpj5BayiQD4PtM3ayy9iYNSsMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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