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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd11b7461a4ea9f228a29bbcd28e932a30d572736bd95ce69ffbb26e5bcf3c4d' 
  AND token = 'PNLj848kMSewxt3mVlvSr5s/X7Dua1JIABxtzca0Z9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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