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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac1a1d3ca6cc3a1fc34812087f52f2aa0695ef81ce200dd610660aea94f65f2' 
  AND token = 'muJ0f0+QElHXJC00tSii5P9RDv5sYncMzBoIkqI+kXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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