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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c438ae088a4d8b91610cba0a79dc07c87eed41ab8fe7312dca46990df8bfdbee' 
  AND token = '95xQ3tpJQBrwSg3/bG2zV2i9cb6o99CaBnEqUMU7aTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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