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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd1e6fe52fd06c81f6012af4fa612c349ac5d95778cac449d7f0f3e6abcd770' 
  AND token = 'AhyK5hv3GaiTqNgfGyG4gr/xwXM4fsaRozUDsoqCKsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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