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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4119d32e18367ad5cb7a5e51eb4710b293f446aa013084533213038fe7a7aa' 
  AND token = '6AG5m3WKGEC2wSfOIwdw/oX5+1VhsTHzafoY0/ZiIp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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