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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf40d5ed896574bdd0190e7da1ebfc3215da3cdc48c42f5374adbd89817d5ac' 
  AND token = 'kdL6MKiG/Ro4elPfwKQyQSAozNKzp9Oq6VZpPM6S7V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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