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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f434ecf0591f48341b5b2ad342fb1181fdffeed46d429dccbb655ae47dce229' 
  AND token = '9iDyscV7dY04uQqlavcpzY5NAyF9irCSMnjxGYOLeKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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