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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953b6f13c6e6d01d018b2b68163172dff53e38783358344ccaf62c7c16fff312' 
  AND token = 'iP1Nrx6wcaBHCv6xsUjcvgx0A2do7OjyNZbcjUd57ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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