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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f735ee409e4121b7ead4f3c4110508ea736db0ca10889239388d0bc59a4ec5ff' 
  AND token = '4PyOG1Xe3OAbLe8o+GYP6DkP0rPNxQLLVRFE3LEJ0Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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