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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100c9d45b2e3fbad5dfbc7ba6cfc89c906e7da5faa21f41e2b7f805cf228afac' 
  AND token = 'ZQe9GAfbbrqJ+El7IJhU87f3B0pgBGKx+nWSaH63U+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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