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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002902e99cb00f92dd01cd671a4c310c2393e900d848119a42c546c590693d21' 
  AND token = 'sDQuH8EfcSYB8ydHyykabrh0y6ImA/J2hwAS6+Rth8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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