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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b68cb488a40f00369adb2c53c2b2c0f65f56ec69118d8b4b10457423460eed9' 
  AND token = '3XY++piyquErTy/zw1Vv11D2Ea29eBS7Jm0Qs0E7m+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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