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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466fcc52246c1e581498c7f29f045ae418df7396f033c49c4eaccb63b895298d' 
  AND token = 'r6HsBHwbaTTYuozri/YJk/8/A4Brs2HCnp8Hkc+JJAg=' 
  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"
    }
  }
}