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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e98d810c4c2e311120eb944866a50e8b4b1546039f973029a1b349915c1a376' 
  AND token = 'vKS0Dv7QAJJVau+VcpT/gk0G23wVA0+WHlMNmPZUGP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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