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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c76694769942d7f084f5394d305fc072e1427535ee2dcf0e3681033db845ea' 
  AND token = 'L8cD7oQNYYXEe0hI1p13z53iBIR36ZmDEbqRsyg6pYY=' 
  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"
    }
  }
}