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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b67ea7c7af11d6d05395794d7f093759743e981545c8cb293c719cfe69bde8' 
  AND token = 'z4QMd7Szbeb/l1woI1BTPIxT9fq+wU5tyqiHGnDNNLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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