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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a930860580e0592b43dc0c355e8bd5328c8f2b1ec64badc7c74f02e72665609d' 
  AND token = 'y+TvYMavqDBS0xn2KpkUI3buysIYKo4/96pSu0Wlgko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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