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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3552ae71f50fa566cb16ea47be8f9859829529cb2c05050d92bc359a03b0fe' 
  AND token = 'IzjeUukNbj5oyE9L6UULXoHq2e+ou0670s0Vj2qAJ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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