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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75055bd6b8c27cee68cae3144a1f92a5a9e010e0840e7ab817e6e5a3fb65d370' 
  AND token = '/Tqt+dvJ+d1cso5TSO/bAosp69OX7vG3iwUJ/HCUVTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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