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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28506fbb276babc5bdfd6851e30161a6b2fd2fc3f0d259a4490a4266c16bab2' 
  AND token = '0gpbiiGjDTj0hbXQiq0MvHgcr2CiLd3Ngt5YmVXWsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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