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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a202f3f3fe9d99da631a6bea0df238dd80a6b07fd12886c6febbcf48ea03abf' 
  AND token = 'IX3ferRc+xKYVZ2bxTzM11rpf+5KpufjvU5ATihuo5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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