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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544bba63ddd488aba2177c5a348fa4077e5c2a01b215a495afa1d371d6f620a0' 
  AND token = 'fDm9zwJf1dZVn4vcskhrDH/PX5NT5ik78IEEkqq34rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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