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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e2b16a89dfedff8b04a5c2a7c4a3c98fb4cdbb1f25d561488470618c76d7a8' 
  AND token = 'F3wmQ/3QKcs47YOr9osvmyOoPtebA0p+iMU41LgckYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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