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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bf7389556b4926ee9c3a9958f4b2d337cbe2075b52996b7e8303531ba987c6' 
  AND token = '4O84a6DKsoV5cSeUARg8ujwDfRK6bT4Uf2tVJz5phfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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