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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eeaa7e52b5b7c9c2e2f1765e1df487ab4a9dd0dc09ad6bedc8c26c8b09a9190' 
  AND token = 'w2aTKXkPs3l0FR0krXtcGw00OuUzdflv6yVMcXjhfgw=' 
  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"
    }
  }
}