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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc5f6529bac41d8cc6d7d9c1d3a46ca7a5e98442bd46fe42d6ba1f6aafcfb7f' 
  AND token = 'WoabtMOt6rhg+U92YKcdUG4Rd2C/8amQpn8M3E169Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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