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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e1e394e4711e1463177d062636804b89fb3d175db5a33e2d5871f15a847f67' 
  AND token = 'pvANIP2L2BMO/D8hi5IpXeaHgT6Za8+w4eT5mmzljG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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