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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ba54e5cfcf54b7e0723c66d1f6208e51dc14a084ee917d092b3df5c26a3813' 
  AND token = 'IhZW9giXc8BgXNoGLE0FXYzhi2RdFKLBJ9smXHcEYLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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