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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63893a07b434d9e4d6cb3a756d0abd1fe65adb5d6f37889dcb0d0f5d8f1c2307' 
  AND token = '1bpbWyt7fHU1L6l1Gkw/JZhpOnwlHuIefZh5+AcyLKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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