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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c696ef49c15b6803e29bda7ba61356ed90bfe1cca16a8385b4e09ebecff40fa1' 
  AND token = 'OF60VFbCtdGHp5Pa5fABedERyKcCuEyE8v+c/2GH2ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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