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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d93627451179ff9b1d4a4360d16f0d0fe934ad93934274593ce4541a24ea859' 
  AND token = 'ztEiYm3Q5rhRt6T8ujI8Hbn6OnlugclK3XtmcnQqY4s=' 
  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"
    }
  }
}